From: Joonyoung Shim Date: Tue, 28 Jul 2015 08:53:18 +0000 (+0900) Subject: drm/exynos: remove mutex locking in pagefault handler X-Git-Tag: firefly_0821_release~176^2~1083^2~30^2~9 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=67412d15afb7cc34943157c4bce2cf138b579fd1;p=firefly-linux-kernel-4.4.55.git drm/exynos: remove mutex locking in pagefault handler There is no reason to use mutex locking in pagefault handler. Signed-off-by: Joonyoung Shim Signed-off-by: Inki Dae --- diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c index f717d795e9ae..0c53b858bfec 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c @@ -560,7 +560,6 @@ unlock: int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { struct drm_gem_object *obj = vma->vm_private_data; - struct drm_device *dev = obj->dev; unsigned long f_vaddr; pgoff_t page_offset; int ret; @@ -569,14 +568,10 @@ int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) vma->vm_start) >> PAGE_SHIFT; f_vaddr = (unsigned long)vmf->virtual_address; - mutex_lock(&dev->struct_mutex); - ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset); if (ret < 0) DRM_ERROR("failed to map a buffer with user.\n"); - mutex_unlock(&dev->struct_mutex); - switch (ret) { case 0: case -ERESTARTSYS: